Honestly I think you are going to be hard pressed to find one for that much in decent shape. They typically hold their value very well and even more so now with ammo costs staying so high with ongoing shortages of various calibers.
Only other place I could suggest to check are some of the forums like thehighroad.org (registration required to see for sale section). I've had the best luck with finding good deals there and alot of good people on there.